Combined type-writing and computing machine.



W. WRIGHT;

COMBINED TYPE WRITING AND COMPUTING MACHINE.

' APPLICATION FILED APR. I9. 1910. 1,237,438. Patented Aug. 21,1917.

3 SHEETS-SHEET I,

him/l m y w. WRIGHT.

COMBINED TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED APR. I9. I910.

Patented Aug. 21, 1917.

3 SHEETS-"SHEET 2.

W. WRIGHT.

COMBINED TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED APR.!9.1910.

Patented Aug. 21, 1917.

3 sHEETs SHEET 3 UNITED STATES PATENT orrros.

WALTER WRIGHT, OF NEW YORK, N. Y.,

ASSICNOR '10 UNDERWOOD COMPUTING MACHINE COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

COMBINED TYPE-WRITING AND COMPUTING MACHINE.

Specification of Letters Patent.

Patented Aug. 21, 1917.

Application filed April 19, 1910. I Serial No. 556,87 8.

Type-Writin and Computing Machines, of

whlch the'fo owin is a specification.

This invention re ates to computing mechanisms, particularly those which are combined with typewriter mechanisms, and 1s 1n the nature of an improvement upon the devices shown in Patent 990,238 to Gustave O. Degener, dated April 25, 1911, and upon the device shown in an application filed by Walter Wright and Gustave O. Degener February 12, 1910, No. 543,603;

The present improvements relate mainly to means for preventing simultaneous operation of two keys; or the premature operation of one key before the otherreturns to normal position; and the principal ob ect of the invention is to provide simpllfied, 1nexpensive and effective means for this purpose, which will have httle or no tendency to reduce the speed of an eflicient operator.

In the present instance, the numeral keys I of the typewriter are illustrated as controlling the computing mechanism; and connected to each of said numeral keys is a blade or the like, these blades being disposed around a common center and movable independently across said center, so that, when one is so moved, the others cannot move, and hence the depression of one numeral key locks all the remaining keys.

In connection with such a construction, I have provided an additional interfering blade, which is connected to all of the alphabet keys of the typewriter; a universal bar erate an interfering blade, preferably the same blade that is operated by the alphabet keys; with the result that, whenever the spacing key is depressed, the operation of a numeral key is revented.

The usual ta ulating keys may also be provided with means to operate such an interfering blade, preferably the same one that is operated by the alphabet keys and said word-spacin key; a second universal bar being opera le by any of said tabulating keys, and operatively connected to said addi-- tional interfering blade.

According to the present improvements, a locking universal bar or device isdirectly operated by the keys or key levers; moving from normal to abnormal position together with keys and returnin therewith. This movement, of course, is ldle, so long as the keys are depressed in proper sequence; but if it be attempted to operate any numeral key before the return to normal position of any alphabet or other key, the interfering blade belonging to such numeral key will collide with the interfering blade which has been operated by the alphabet or other key. The movements of this universal bar and the blades are quick and certain, and, even when the machine is operated very rapidly, there will not occur a locking of any key under the operators finger and consequent confusion of the operator, unless there is carelessness in the manipulation of the keys. The machine is, therefore, well adapted for an expert operator, and is also suitable for a novlce.

It will be understood that the mechanism not only prevents operation of a succeeding key before the first key is arrested, but also prevents the simultaneous down strokes of two keys, whether adjacent or not, so long as one of said keys is a numeral or computing key.

Each computing key is also preferably provided with a pawl and double-ratchet device, which prevents the computing key from returning to normal position before it completes its down stroke, and vice versa; and from this it results that it is impossible to operate an alphabet key, a space key, or a tabulator key before the substantial completion of the up-stroke of a computing key; this being an advantage, inasmuch as the proper operation of the computing mechanism depends upon the movement of the carriage, which latter, of course, would otherwise be prematurely operable by the alphabet keys, the space key or the tabulator keys. It is also apparent that in case a numeral key be not f y depressed, the alphabet and other keys will be inoperable until the depression of such key is completed and the same returns to normal position.

As set forth in my pending application N 0. 554,452, filed April 9, 1910, settable pins on the escapement wheel of the computing mechanism are operable by means of swinging cams connected to the keys. In the present instance, said cams are formed integral with said interfering blades, whereby the structure is much simplified and improved.

The computing mechanism, and all of the interfering blades, are readily disconnected when it is desired to use the machine solely for typewriting.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a side elevation, partly in section, of the present improvements applied to an Underwood front strike typewriting machine.

Fig. 2 is a plan View of the principal devices seen at Fig. 1.

Fig. 3 is a sectional elevation to show the grouping of the interfering blades, one of which is shown as moved across the common center to effective position, thus blocking the operation of the remaining blades.

Fig. 4 is a perspective view of the principal elements of the mechanism attached to the computing mechanism seen at Fig. 1, particularly the locking devices.

Fig. 5 is a sectional rear elevation of the interfering blades, showing, in effective position, the extra blade which is connected to all of the alphabet keys of the typewriter, as well as to the spacing key and the tabulating keys.

Fig. 6 is a sectional front elevation of a fragment of the computing -mechanism showing the master wheel, its shaft, the gearing connected to said shaft, and one of the computing wheels meshing with said master wheel.

Typewrz'ting mec'ham'sm.The typewriting mechanism includes alphabet and character keys 1 and numeral keys 2, all mounted upon levers 3, having returning springs 4 and connected by means of elbow levers 5 with type-bars 6, to cause the latter to swing upon pivots 8 to the platen 7.

Each type-bar carries a heel 9, to press rearwardly a universal bar 10, mounted upon a frame, 11, the latter pivoted at its rear end to idle arms 12*. bar frame 11 swings rearwardly a dog rocker 12 carrying a feeding dog 13 and a detent dog 14, whereby a paper-carriage 15 is given its letter-feeding motion, said carriage being propelled by a spring 15. Said I dogs move into and out of engagement with an escapement wheel 16, which is connected Said universal.

to a pinion 17, the latter meshing with :1 rack 18 upon said carriage. Upon the universal bar is provided an actuator 19 for a ribbon-vibrating lever. As so far described, the parts are in common use upon the Underwood typewriting machine.

Whenever a key is depressed, the elbow lever 5 is swung forwardly, and the typebar is swung rearwardly against the platen to make an impression thereon, and the uni- 76 versal bar pushes the feeding-dog 13 out of engagement with the escapement wheel -16, and the detent dog 14 into engagement with said wheel; no letter-feeding motion of the carriage occurring at this time. Upon 80 relieving the key from pressure, the parts are returned to normal positions in the usual manner, the universal bar being returned by a spring 21, and moving the detent out of engagement with the escapement wheel 16, and the feeding-dog 14 into engagement therewith; said feeding-dog permitting the carriage to advance a letter space under the influence of the driving spring 15*, as usual.

Computing me0ham'8m.All of said keys control the letter-feeding movements of the carriage 15; but only the numeral keys 2 are connected to the computing mechanism, which is power-driven, its motor being in dicated at 22, and being connected by a suitable train of gearing to the adding wheels 23, and a primary escapementwheel 24, the latter being under the control of the numeral keys 2, whereby the keys are enabled to determine how far the computing wheels 23 shall be rotated by the motor 22. The primary escapement wheel 24 forms, therefore, part of an indexing mechanism whereby the numeral keys determine how far the master wheel which operates the computing wheels shall turn.

Preferably, the motor 22 is constantly revolving, although the primary escapement wheel 24 remains motionless, together with the computing wheels, until the keys 2 are operated. The connection from the motor includes any suitable slip clutch 25, whereby is driven a shaft 26, the latter having a pinion 27 meshing with a pinion 28, whereby is rotated a shaft 29, having at its opp0- site end a pinion 30. To the last is connected, by means of a gear 31, a pinion 32 upon a shaft 33, the latter also having a pinion 34, which is connected by means of a pinion 35 to vertical shaft 36, the latter carrying a pinion 37, meshing with a pinion 38 fixed upon shaft 39, which carries a master-wheel 40, arranged interiorly of a series of computing wheels, in the shape of rings 41, having internal teeth 42 to engage the projecting master-wheel teeth. The computing wheels are supported upon a special carriage or frame 43, which is connected by arms or lugs 44 to the typewriter carriage 15, to travel therewith, whereby the computing wheels are given a denominational movement, relatively to the stationary master-wheel, at every letter-feeding movement of the main carriage 15. For carrying tens from one computing wheel to the next, there maybe employed any of the devices illustrated in any of my pending applications, or any other suitable tens-carrying devices. The wheels 41 mesh with number-bearing wheels 41.

The primary escapement Wheel 24 s connected to the described train of gearing by means of pinion 45, on the shaft of the escapement wheel, said pinion meshing with car 46 fixed to gear 31 already described. gaidescapement wheel 24 carries a set of. settable pins or cogs 47, one of whlch 1s projected and in enga ement w1th a fourtoothed pinion 48, w ich is connected to a secondary escapement wheel 49, the latter normally ressing against a detent dog 50.

The roc ing of said dog 50 permits the tooth of the secondary escapement wheel 49 to escape from said dog and be caught by a feeding dog 50; and the return movement of the dogs permits the wheel 49 to escape or feed, so that the succeeding tooth of the four-toothed pinion 48 may be engaged by the next projected cog or pin 47 to arrest the primary escapement wheel 24, and hence the described train of gearing, including the computing wheels 41.

The escapement pins 47 are projected by means of the numeral keys 2, the latter being connected by links 51, pendent from bell-cranks 52 and having books 53 to engage suitable projections or parts 54 on the key levers 3. The bell cranks are connected by horizontal links 55 to arms 56, sultably pivoted at 57, and preferably formed at their opposite ends with cams 58, for camming the escapement pins 47 from normal positions to projected positions, to enable them to engage the four-toothed pinion 48. The arms 56 are normally adapted to engage a universal disk or member 68, around which the arms are grouped radially. Said disk is mounted upon a guide rod 69 and has a returning spring 70. Upon the rod 69 is provided a head or collar 71, and the end of a lever 72 is confined between said head and said universal bar or member 68 to be operated thereby. The lever is pivoted at 73 to any fixed support, and connected by a link 61 to an arm 60 and a rock shaft 59, so as to enable any of the numeral keys 2 to rock or reciprocate the dogs 50, 50, to control the starting and stopping of the primary escapement wheel 24 of the computing mechanism.

With the exception of the cams 58, the computing mechanism details so far described are set forth in certain of said pending applications.

65 Operation-In the operation of the parts so far described, the keys 1 may be manipulated for ordinary typewriting in the manner already set forth- When a numeral key 2 is depressed, it also swings up its typebar to print, and the type-bar operates the universal bar 11 of the letter-feedlng mechanism, the rear of the latter engaging a prov jection 12 on the dog rocker and moving the feeding-dog 13 out of engagement, and the detent dog 14 into engagement with the escapement wheel 16. At the same time the link 51 is pulled down b said key, and bell crank 52 isturned, an by means of the link 55 swings arm 56, thereby operating the universal member 68 and the lever 72, which, through the thrust link 61 and the rock arm 60, turns the rock shaft 59 and the dogs thereon and permits the secondary escapement wheel 49 to escape from the detent dog 50 which corresponds to the limber dog usually employed in the carriage feedmgDmechanisms of typewriting machines.

uring the swinging of the arm 56 effected by the depression of the key 2, the cam 58 on said arm engages the adjacent pin 47 on the main escapement wheel 24, and projects the same into position to engage the four-toothed pinion 48. No other movement of any part of the adding mechanism occurs upon the down stroke of the key the adding wheels all remaining stationary upon such down stroke.

Upon the relief of the key 2 from pressure, the type bar and key lever are returned to normal positions, together with 100 arm 56, cam 58, universal member 68, and the parts connected to the latter, including the lever 72. Upon the return of the type bar from the platen, the spring 21 moves the universal bar forwardly, and the detent 105 dog 14 escapes from, and the feeding-dog 13 moves into the line with, the escapement wheel 16 of the carriage 15, and the spring 15 is permitted to pull said carriage the width of one letter."-

The universal member 68, and its connected parts, are returned to normal positions by the spring 70. The secondary escapement wheel 49 escapes from the dog 50*, and the motor 22 operating through the 115 clutch 25, now drives the gearing of the computing mechanism, and the escapement wheel 24 revolves until it is arrested by that tooth 47 which was projected by the key 2 just released. The previously projected pin 120 is returned to normal position by a fixed cam 73. The projected pin 47 determines the extent of rotation of the power driven primary escapement wheel 24, and hence of the master wheel 40 and of the computing 125 wheel 41 with which the master wheel is at the time in engagement.

This release of the secondary escapement wheel 49 occurs at the final portion of the letter-feeding movement of the paper car- 130 riage 15. The succeeding tooth of the secondary escapement wheel 49 is arrested by the dog 50.

It will be seen that the relative denominational movement between the computing master wheel 40 and the computing wheels 41 is controlled by the carriage 15; the carriage 43 connected thereto being caused to move from one denomination to the next at each letter-feeding movement of the carriage 15.

The links 51 which connect the keys 2 to the bell crank 52 are passed through holes 74 in a horizontal bar 75. The latter may also be shifted endwise to the left (Fig. 4) to disconnect said links, so that the keys 2 may be operated without actuating any part of the adding mechanism. Said bar 75 may be provided with a finger piece 76, and a detent 77 may hold the'bar at either end of its movement. It will be understood that the links 51 swing around points 78 at which they are pivoted to the bell cranks 52.

Means for enabling each numeral key to interfere 'wth the operation of the other numeral keys.

Each of the key-operated arms 56 may be provided with an interference member in the form of a blade 80 which may be in the form of a segment having the pivot 57 as a center; the pin-setting cam 57 being formed upon the outer portion of said blade. These blades 80, which are carried upon the ends ofextensions 81 of said arms 56, are loosely mount-ed or supported in a series of radial slots 82 formed in a fixture 83, and the tips of the blades lie in a row which forms the principal portion of a circle around a small central opening 84 in said support 83. So long as said opening is occupied by any blade, no other blade can pass through said opening, as it will encounter the first blade; and hence it is impossible to operate any of the remaining figure keys until the first key is returned to or substantially to normal position. Thus, each numeral key 2 interferes with the operation of all the other numeral keys, so that it is not practicable to depress more than one numeral key at a time; and as soon as one numeral key is partly depressed, the depression of any other numeral key is prevented.

Means for causing interference betweeneaoh numeral key and the alphabet and other keg 8.

An additional interfering blade 85, not provided with a cam 58 and not operating any pin 47, works in one of the slots 82, and is connected to the alphabet keys to be operated thereby. This blade 85 is formed upon an arm 86 similar to the arms 56, but incapable of working the universal disk member 68, the latter being cut away at 87 for this purpose.

upper end of a pendent link 119, having at its lower end a hook 120 to engage under an arm 121. This arm is mounted loosely upon a rock shaft 122, (upon which latter are fixed the forwardly extending levers 123 bearing the usualword-s acing key 124 at the front of the keyboar This arm 121 forms one of a pair, the other member of the pair being designated as 125, and both being loosely pivoted upon said rock shaft 122, and being rigidlv connected by a bar 126 close to said shaft 122. At their forward ends said arms 121,125 support a horizontal bar or rod 127, extending across-the machine in front of the keys 2 and directly beneath those key levers 3 which bear the alphabet keys 1. The rod 127 is fixed to the arms 121, 125. These parts, taken together with the bar 126, form a rigid frame, which may be swung down about the pivot 122 by depression of any of the alphabet keys 1, as will be understood from lnspection of Fig. 1.

It will be understood from the foregoing that when one alphabet key is depressed, it carries down the universal bar 127 together with the arms of the frame of which it forms a part; the arm 121 of said frame putting down link 119, whereby the bell crank 116 is rocked and the link 114 is caused to swing the arm 86 and the blade 85 into the positions seen at Figs. 4 and 5; said blade moving into and across the opening 84, and hence preventing the operation of any of the blades 80 or the numeral keys to which the latter are connected. Upon the relief of the alphabet key from ressure, the parts are returned to norma position by a. spring 127.

Space key interferenoa-In order also to prevent operation of the carriage 15 through the space key 124 when a numeral key is depressed, or vice versa, there is hung from said rod 127 a pair of links 128 carrying lugs 129 which project beneath said levers 123 of the space key. It will be understood that the effect or purpose of these lugs 129 with respect to the space key is similar to that of the bar 127 With respect to the alphabet keys 1, and hence that the space key cannot be depressed to operate the carriage feeding device until the return to or substantially to normal position of the previously depressed computing key 2. As is usual in the Underwood machine, the rock shaft 122 of the space key is provided with an arm 130, to operate an arm 131 extending forwardly and downwardly from the idle arms 12*.

Tabulating key loek.-Said Underwood alphabet keys and having means to revent simultaneous operation of any alpha et and common to all the blades, so that w en one blade occupies such common position the other blades are prevented from operating, whereby their keys are locked.

3. In a combined typewriting and com puting machine, the combination of a set of numeral keys, a computing mechanism controlled thereby, a set of type-operating alphabet keys, a set of blades, certain of sa1d blades being connected to said numeral ke s, and a universal bar or member operable y any of said alphabet keys and connected to one of said blades; all of said blades movable by their keys to a position common to all the blades, so that when one blade occupies such common position the other blades are prevented from operating, whereby thelr keys are locked. L

4:- In a combined typewriting and com puting machine, a set of type-operating numeral keys, a computing mechanlsm controlled thereby, a set of type-operating alphabet keys, a word spacing key, means to preveiit simultaneous operation of any two of said numeral keys, and a single device operable by any of said alphabet keys or said spacing key, and having means to prevent operation of any numeral key with any alphabet key, or with said spacing key.

5. In a combined typewriting and computing machine, the combination of a set of numeral keys, a computing mechanism controlled thereby, a set of type-operating alphabet keys, a word-spacing key, and a setof blades; certain of said blades being connected to said numeral keys, and certain of said blades being connected to said alphabet keys and said spacing key; all of said blades movable by their keys to a position common to all the blades, so that when one blade occupies such common position the other blades are prevented from operating, whereby their keys are locked.

6. In a combined typewriting and computing machine, the combination of a set of numeral keys, a computing mechanism controlled thereby, a set of type-operating alphabet keys, a word-spacing key, a set of blades, certain of said blades being connected to said numeral keys, and a universal bar or member operable either by said spacing key or by any of said alphabet keys and connected to one of said blades; all of said blades movable by their keys to a position common to all the blades, so that when one blade occupies such common position the other blades are prevented from operating, whereby their keys are locked.

7. In a. combined typewriting and computing machine, the combination of a set of type-controlling numeral keys, a com uting mechanism controlled thereby, a set o tabulating keys, a carriage, a difierentially movable part of said computing mechanism connected to said numeral set of blades; certain of said blades being connected to said numeral keys, and one of said blades being connected to said tabulating keys; all of said blades movable by their keys to a position common to all the blades, so that when one blade occupies such common position the other blades are prevented from operating, whereby their keys are locked.

In a combined typewriting and computing machine, the combination of a set of type-controlling numeral keys, a computing mechanism controlled thereby, a set of typeoperatin alphabet keys, a carriage, a differential y movable part of said computing mechanism connected to said numeral keys, a set of tabulating keys for said carriage; a set of blades, certain of said blades being connected to said numeral keys, a universal bar operable by any of said alphabet keys, a universal bar operable by said tabulating keys, both universal ba'rs connected to certain of said blades; all of said blades movable by their keys to a position common to all the blades, so that when one blade occupies such common position the other blades are prevented from operating, whereby their keys are locked.

9. In a combined typewriting and com puting machine, the combination of a set of type-controlling numeral keys, a computing mechanism controlled thereby, a set of typeoperating alphabet keys, a word spacing key, a carriage, a set of tabulating keys for said carriage, a differentially movable part of said computing mechanism connected to said numeral keys, and a set of blades; certain of said blades being connected to said numeral keys, and one of said blades being connected to said alphabet keys, and said spacing key, and said tabulating keys; all of said blades movable by their keys to a position common to all the blades, so that when one blade occupies such common position the other blades are prevented from operating, whereby their keys are locked.

10. The combination of a computing mechanism including a series of settable members, a series of numeral keys, a series of diverging levers connected to said keys, cams upon said levers to be swung thereby into engagement with said members to set the latter, and blades provided upon said keys, and a" machine is also frequently provided with a tabulating mechanism, comprising depressible keys 132 upon the forward ends of levers 133, which are fulcrumed at 134between their ends and articulated at their rear ends at 135 to upstanding thrust-rods 136 which carry at their upper ends denomination stops 137, to engage column sto s 138 carried upon a rack 139 which is usua ly secured to the pa er carriage 15. Said thrust rods 136 are a apted to cause a movement of the paper carnage 15; lugs or shoulders 140 on said thrust rods 136 engaging a short universal bar 141, which is supported by an arm or arms 142 upon a rock s aft 143, the latter havin an arm 144 connected by a link 145 to a lever 146, having a roll 147 to engage and lift the letter feeding rack 18 upon the carriage 15.

.In order to prevent depression of a tabulator key 132, and hence a movement of the carriage 15, durin the depression or the return movement 0 a computing key 2, the links 128 may be extended downwardly at 148 and carry at their lower ends a horizontal universal bar or rod 149 extending across the machine beneath the tabulating key levers 133. The universal bar 149 controls the extra interfering blade 85 in the manner already described respecting the universal bar 127 and the lugs 129. Thus it will be seen that no depression of a computing key can be effected until the return to or substantially to normal position of the previously depressed tabulating key, and hence that the tabulating movement of the carria e 15 will be completed before the operation of such computing key.

This is a feature of importance, especially to prevent the operation of a numeral key prematurely after the depression of the space key or alphabet key, and particularly after the depression of a tabulator key, since the operator is liable sometimes to depress a tabulator key and after holdin it down an instant, to depress a numeral ey before the paper carriage has completed its tabulating run. It will be seen that by this invention the depression of any of the carriage-controlling keys 1, 124 or 132 will move the interfering blade 85 into position to prevent operation of any numeral key. This invention also prevents the operation of a numeral key simultaneously with any of the other keys, since the blade 85 cannot enter the central opening 84 at the same time with any of the blades 80.

It also prevents the operation of any of the keys 1, 124 or 132, while a numeral key is depressed, since when the central opening 84 is occupied by any blade 80, the blade 85 cannot enter said opening, but will collide with said blade 80.

It will thus be seen that the frame or member 121, 125, 126, 127, which is operated by all of the alphabet keys 1, space key 124 andthe tabulator keys 132, by bein connected to the additional single inter erence blade 85, prevents premature operation of any of said keys with respect to any of the adding keys, or vice versa.

It will also be seen that the disconnecting bar also disconnects the extra interfering blade 85 from the alphabet and other keys at the same time that the numeral keys are disconnected from the computing mechanism.

Key oheck.-Each of the bell cranks 52 (one of these being provided for each nu-.

meral key) is preferably .provided (as set forth in application No. 543,603, filed February 12, 1910, by Walter Wright and Gustave O. Degener), with a segmental ratchet 158, and pivoted upon the frame of the machine at 159 is a pawl 160 to engage the teeth of said ratchet in a manner to prevent premature reversal of the associated key. When the key starts to move down, the pawl engages the ratchet and prevents return movement of'the key, so that it becomes necessary to press the key down to the limit of its movement, whereupon the ratchet will clear the pawl, and the latter will be swung .by its spring 161 into position to ren age provided with a similar ratchet to cooperate with a similar pawl, this being particularly useful in connection with the tabulator keys, to insure that the down stroke of the tabulator key shall be finished, and also'that it shall return to normal position before being reoperated. This will prevent liability of a computing key being operated durin a partial operation of-the tabulatin mec amsm, or a false movement of any 0 the tabulating parts or of the carriage.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be employed without others.

Having thus described my invention, I claim:

1. In a combined typewriting and computing machine, a set of type-operating numeral keys, a computing mechanism controlled thereby, a set of type-operating alphabet keys, means to prevent simultaneous operation of any two of said numeral keys, and a single device operable by any of said levers to move to a position to enable each blade to intercept the remaining'blades.

11. The combination of a computing mechanism including an escapement wheel having settable members, a series. of numeral keys, a set of diverging levers connected to said keys, a set of cams upon said levers to be swung into engagement with said settable members to cam the latter to the keys, means to enable said keys to re- "lease and arrest said escapement wheel, and a set of blades provided upon said leversand movable to a common position to enable each blade to intercept the remaining blades. v

12. The combination of a computing mechanism including an escapement wheel having settable members, a series of numeral keys, a set of diverging levers connected to said keys, a set of came upon said levers to be swung into engagement with said settable members to cam the. latter to effective position at the down strokes of the keys, means to enable said keys to release and arrest said escapement wheel, a set of blades provided upon said levers and movable to a common position to enable each blade to intercept the remaining blades, the latter in-the form of segments curved concentrically to the pivots of their respective levers.

13. The combination of a computing mechanism including an escapement wheel having settable members, a series of numeral keys, a set of diverging levers connected to said keys, a set of cams upon said levers to be swung into engagement with said settable members to cam the latter to effective positions at the down strokes of the keys, means to enable said keys to release and arrest said escapement wheel, and a set of blades provided upon said levers and movable to a common position to enable each blade to intercept the remaining blades; the latter in the form of segments curved concentrically to the pivots of their respective levers, said cams bein formed at the junction of the blades and evers.

14. The combination of a computing mechanism including a series of settable members, a series of numeral keys, a series of diverging levers connected to said keys, cams upon said levers to be swung thereby into engagement with said. members to set the latter, and blades provided upon said levers to move to a position to enable each blade to intercept the remaining blades; each cam being formed in such position as to engage such settable members at the final portion of the down stroke of the key.

15. The combination of a set of type-operating numeral keys, a computing mechanism controlled thereby, a carriage, a spacing key, tabulating mechanism, a set of blades, certain of said blades being connected to said numeral keys, and a member 0 erable either by said spacin key or by sai tabulating mechanism an connected to one of said blades; all of said blades movable by their keys to a position commonto all the blades, so thatwhen one blade occupies such common position the other blades are prevented from operating, whereby their keys are locked.

16. The combination with groups of typeoperating keys, of interfering blades connected to said keys to enable any key to prevent the operation of the remaining keys,

said keys being divided into groups, and one of said groups being operatively connected to a single one of said interfering blades.

17. In a combined typewriting and adding machine, a set of type-operating numeral keys, a computing mechanism controlled thereby, a carriage, a differentially movable part of said computing mechanism connected to said numeral keys, a set of type-operating alphabet keys, a Word-spacing key, a

tabulating mechanism for said carriage,

means to prevent simultaneous operation of any two of said numeral keys, a single device operable either by any of said alphabet keys, or by said spacing key, or by said tabulating mechanism, and having means to prevent operation of any numeral key simultaneously with any alphabet key, or with said spacing key, or with said tabulating mechanism, and means to prevent premature reversal of the numeral key movements.

18. In a combined typewriting and adding machine, the combination of a set of numeral keys, a computing mechanism controlled thereby, a set of type-operating alphabet keys, and a set of blades; certain of said blades being connected to said numeral keys, and certain of said blades bein connected to said alphabet keys, all 0 said blades movable by their keys to a position common to all the blades, so that when one blade occupies such common position. the other blades are prevented from operating, whereby their keys are locked, and means operable at will to disconnect all of said blades from their keys, and simultaneously disconnect said computing mechanism from said numeral keys.

19. In a combined typewriting and com-. puting machine, the combination with a computing key, of a plurality of alphabet keys, an escapement settable by said computing key on its downward stroke, and means preventing the operation of any alphabet key until the return stroke of said computing key is substantially completed.

20. In a computing machine, the combination with a computing wheel and numeral keys controlling saidwheel, of an arm moved by a numeral key for determining how far said numeral wheel shall turn, and

' comprising a straight member, a scytheshaped extension, a hump on said extension, an arm extending at an angle from said straight member, a pivot in said arm, a hole for the link in said arm, an escapement comprising pins set by said hump, and a gulde comprising openings for radially arranged interfering blades.

22. In a combined typewriting and computing machine, the combination with computing wheels, of numeral keys operating type, alphabet keys operating type, an arm operated by each numeral key for determining how far the computing wheels shall be rotated, an extension on each arm preventing the o eration of one key until the operation o a previously depressed key has been substantially completed, means coopcrating with said extension for preventing the operation of any alphabet key until the operation of the numeral key is substantially complete.

23. In a combined typewriting and computing machine, the combination with computing wheels, of numeral keys operating type, alphabet keys operating type, an arm operated b each numeral key for determining how ar said computing wheels have been rotated, an extension on each arm preventing the operation of one key until the operation of a previously depremed key has been substantially completed, and an arm operated by the alphabet key and cooperating with said extension for preventing the operation of a numeral key until the operation of any alphabet key is substantially complete.

24. In a combined typewriting'and computing machine, a set of type-operating numeral keys, a computing mechanim controlled thereby, a set of type-operating alphabet keys, means to prevent simultaneous operation of any numeral key either with any alphabet key or with any of the remaining numeral keys, and means for simultaneously disconnecting said numeral keys from said computing mechanism and all the keys from said preventing mechanism.

25. The combination of a set of numeral keys, a computing mechanism controlled thereby, a spacing key also having control of said carriage, means to prevent simultaneous operation of any numeral key with said spacing key, and means for simulta- -neously disconnecting said numeral keys from said computing mechanism and all the keys from said preventing mechanism.

26. In a combined typewriting and computing machine, a set of numeral keys, a computing mechanism controlled there y, a set of type-operating alphabet keys, a wordspacing key, means to prevent simultaneous operation of any numeral key either with any alphabet ke or with said spacing key or with any of the remaining numeral keys, and means for simultaneously disconnecting said numeral keys from said computing mechanism and all the keys from said preventing mechanism.

27. The combination of a set of type-controlling numeral keys, a computing mechanism controlled thereby, a tabulating mechanism, means to prevent simultaneous operation of any numeral key with said tabulating mechanism, and means for simultaneously dlsconnectmg sald numeral keys from said computing mechanism and all the keys from. said preventing mechanism.

numeral keys, a computing mechanism controlled thereby, a set of type-operating alphabet keys, a word-spacing key, tabulating keys, means to prevent simultaneous operation of any numeral key either with any alphabet key, or with said spacing key 'or with any of'said tabulating keys, or with any of the remaining numeral keys, and means for simultaneously disconnecting said numeral keys from said computing mechanism and all the keys from said preventing mechanism.

30. In a combined ty ewriting and computing machine, the com ination with alphaet and numeral keys, of a universal member operated by said alphabet keys only, a safety device operated by each numeral key, a cooperating safety device operated by said universal member, .and a computing machine escapement operated by said numeral keys one at a time as determined by said safety device.

31. In a combined typewriting and computing machine, the combination with computing mechanism, of numeral keys controlling said computing mechanism, alphabet keys, a universal bar operated by said alphabet keys but not by said numeral keys, a safety devlce operated by each numeral key,

a safety device operated by said universal bar, means for dlsconnecting said numeral keys from said computing mechanism, and means for simultaneously disconnecting said universal bar from its safety device.

32. In a combined typewriting and computingmachine, the combination with numeral keys and alphabet keys, of a'computing mechanism under the control of the numeral keys, means for preventing the operation of two numeral keys simultaneously, means for preventing the operation of any alphabet key while a numeral key is depressed, and means for disconnecting said numeral keys from said computing mechanism and from their preventing means, and for simultaneously disconnecting said alphabet keys from their preventing means.

33. In a computing machine, the combination with a plurality of numeral keys, and locking mechanism therefor having interlocking members, of an additional locking member, a universal bar connected thereto, and a set of alphabet keys, said universal bar operable by said alphabet keys.

34:. In a combined typewriting and computing machine, the combination with an actuating member, of an indexing mechanism to determine the degree of movement of said actuating member, type-operating keys controlling said indexing mechanism, locks for said keys intermediate said indexing mechanism and the keys, other type-operating keys, and locking means for the index controlling keys made effective by said other type-operating keys, said keys ineffective on said indexing devlce.

35. In a combined typewriting and computing machine, the combination with computing mechanism, of indexing mechanism to control the same, type operating keys controlling said indexing mechanism, locks for said keys, other type operating keys ineifective on said indexing mechanism, locking means made effective by said other keys and eifective on said index controlling keys and means for making all of said locks inefi'ective.

36. In a combined typewriting and computing machine, the combination with keys arranged in two banks, of a universal bar cooperatin with said keys, said universal bar comprising a member cooperating with one bank and another member coiiperating with the other bank, and locking devices for said keys operated by said universal bar.

37. In a combined typewriting and computing machine, the combination with keys arranged in two banks, of a universal bar cooperating with said keys, said universal bar comprlsing a member cobperating with one bank and another member cobperating with the other bank, locking means operated by said universalbar, and means for dis- 7 connecting said universal bar from said locking means.

38. In a combined typewriting and computing machine, the combination with keys arranged in two banks, of a universal member cooperating with the keys of both banks, a locking device operated by said universal member, another bank of keys, a locking device connected to each of said last-mentioned keys each cooperating with said locking device operated by said universal member and a single means for simultaneously connect- 1ng said universal member and said lastnamed keys to said locking devices and for disconnecting them therefrom.

39. In a combined typewriting and computing machine, the combination with alphabet and numeral keys, of computin devices controlled by numeral keys, and Iocking devices controlled by alphabet keys, effective on each numeral key but ineifective on an alphabet key.

40. In a combined typewriting and computing machine, having a set of type-operating numeral keys, a computing mechanism controlled thereby, a set of type-operating alphabet keys, a denomination-determining carriage controlled by all of said keys, a tabulating mechanism for said carriage and a differentially-movable part of said computing mechanism controlled by said numeral keys, the combination of means to prevent simultaneous operation of any two of said numeral keys, and a single device operable either by any of said alphabet keys, or by said tabulating mechanism, and having means to prevent operation of any numeral key simultaneously with any= alphabet key or with said tabulating mechanism, whereby said carriage cannot be operated by any of said keys while a computing operation is going on.

41. In a combined typewriting and computing machine, having a set of type-operating numeral keys, a computing mechanism controlled thereby, a carriage, a differentially-movable part of said computing mechanism connected to said numeral keys, a set of type-operating alphabet keys, a word spacing key, and a tabulating mechanism for said carriage; the combination of means to prevent simultaneous operation of any two of said numeral keys, and a single device operable either by any of said alphabet keys, or by said spacing key, or by said tabulating mechanism, and having means to prevent operation of any numeral key simultaneously with any alphabet key, or with said spacing key, or with said tabulating mechanism, whereby said carriage cannot be operated by any of said keys while a computin operation is going on.

42. n a combined typewriting and computing machine, the combination with numeral keys and interlocking members certain of which are connected individually to said numeral keys to prevent operation of I any two thereof simultaneously, of other keys and a device universal to said other keys and connected to one of said interlocking members.

43. In a co-nputing machine, the combination with a plurality of numeral keys and locking mechanism having interlocking members, certain of which are connected to said numeral keys, a universal bar connected to one of said interlocking members, a set of alphabet keys, said universal bar operable by said alphabet keys, a second universal bar also connected to the last-mentioned interlocking member, and a set of tabulator keys by which said second universal bar is operable.

44. In a combined typewriting and com-' puting machine, the combination with numeral keys and interlocking members certain of which are connected individually to said numeral keys to prevent operation of any two thereof simultaneously, of various other keys and connections from all of said 1other keys to one of said interlocking memers.

45. In a computing machine, the combination with a set of alphabet keys, and a set of numeral keys, of a member movable by any of said alphabet keys, a computation mechanism, and means to render the computation mechanism inoperable at the movement of said movable member, whereby computing cannot be done during the operation of the alphabet keys.

WALTER WRIGHT.

Witnesses:

K. FRANKFORT, C. RIPLEY. 

